Apparatus for handling glass or the like



Nov. 28, 1961 G. A. RUSS EI'AL 3,010,753

' APPARATUS FOR HANDLING GLASS OR THE LIKE Filed April 1, 1959 3Sheets-Sheet l A I WW; A

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Nov. 28, 1961 e. A. RUSS ETAL APPARATUS FOR HANDLING cuss OR THE LIKEFiled April 1. 1959 3 Sheets-Sheet 2 Nov. 28, 1961 e. A. RUSS EM; 10,

APPARATUS FOR HANDLING cuss OR THE LIKE Filed April 1. 1959 3Sheets-Sheet 3 ll W 5 mil United States Patent 3,016,753 APPARATUS FORHANDLING GLASS OR THE LIKE George A. Russ, Glenview, and Bernard Nathan,Lincolnwood, Ill., assignors, by mesne assignments, to The AmericanSecurity Company, Wilmington, DeL, a corporation of Delaware Filed Apr.1, 1959, Ser. No. 803,532 11 Claims. (Cl. 294118) Our invention relatesto an apparatus for handling glass and has particular reference to aconveying mechanism adapted for use in the tempering and annealing ofglass in sheet form in and through a heating furnace and also for thehandling of the sheets of glass from a heating furnace to the usualblowing mechanism in which currents of air are directed against thesheets of glass for tempering purposes. I

Another and further object of our invention is the provision of glasshandling apparatus, which includes gripping tongs as a part of itsmechanism which are suspended from a supporting apparatus and in whichthe gripping tongs are so fashioned and proportioned that they will gripa sheet of glass and hold it securely in position while beingtransported through a heating furnace or cooling apparatus withoutdanger of the sheets of glass dropping therefrom into the furnacenecessitating the removal of the broken glass and cleaning out of thefurnace before further operations can be conducted.

Another and further object of our invention is the provision of tongs,which because of their particular mounting to the support mechanism arefreely movable at all times in a plurality of directions, and in whichthe legs of the tongs are so connected at their pivotal points ofmovement that the legs are freely movable on the pivotal connectionswhich hold the legs of the tongs together, and the legs of the tongs andtheir supporting links are spaced laterally from each other so thatfreezing together, because of the high heat of the oven, of either thelegs, the supporting links, or the links and the legs of the tongs isnot apt to occur, resulting in the secure holding of each piece of glasswhile being processed.

Another and further object of our invention is the provision of grippingand transporting mechanism for a sheet of glass in which tongs ofcomparative small size are so connected, by means of links, to a commonsupport point that a maximum amount of gripping force is applied to theglass so it will not drop from the transporting means into the heatingfurnace thereby causing difficulty in its operation during the heatingof the glass.

Another and further object of our invention is the provision of sheetglass supporting mechanism which is so mounted that only limited lateralswinging movement of the glass is permitted, which sometimes occurswhile the sheet of glass is being transported through the heatingfurnace but more often in the cooling mechanism, which results in thebreakage of the glass or the loosening of the sheets of glass so theydrop from the supporting mechanism.

Another and further object of our invention is the provision of grippingmechanism for engaging a sheet of glass in such a manner that the glassneed not be cleaned and dirt and oil removed from its surface beforebeing suspended in the gripping tongs, and in which said gripping tongsengage the glass securely without the necessity of having sharpenedpoints in contact with the glass which has been common practice in tongsheretofore used, and which needs frequent adjustment during the daysoperation and frequent sharpening of the glass engaging points of thetongs to insure proper gripping of the glass,

. which sharpening operation results in the stoppage of the 3,010,753Patented Nov. 28, 1961 ice heating and cooling operations causing a lossof time in the glass treating operations.

Another and further object of our invention is the provision of glasshandling mechanism in which one operator can readily attach an ordinarysmall sheet of glass to the mechanism and can also detach a similarsized sheet from the supporting mechanism after the glass has beenprocessed, which said attaching and detaching operations have heretoforebeen conducted by two operators, thereby reducing the labor cost in thetreatment of flat glass.

Another and further object of our invention is the provision of glasshandling apparatus in which stops are provided on the support tongswhereby the location of pits caused by the tongs is controlled andretained at the extreme marginal edge of the sheets of glass and closeenough so that the molding used in mounting the tempered pieces of glasscovers the tong marks and such marks are not visible when such pieces oftempered glass are mounted in frames for actual use.

These and other objects of our invention will be fully and betterunderstood by reference to the accompanying drawings in which- FIGURE 1is a perspective view of a section of our improved glass handlingapparatus;

FIGURE 2 is a side elevational view of a yoke and tongs assembly withthe tongs shown in partially closed position supporting a sheet ofglass;

FIGURE 3 is a view similar to FIGURE 2 with the tongs shown in completeopen position ready to receive a sheet of glass;

FIGURE 4 is a view partially in elevation and partially in section onlines 4 in FIGURE 2;

FiGURE 5 is a sectional view on lines 5-5 of FIG- URE 2;

FIGURE 6 is a sectional view of lines 6--6 of FIG- URE 2; and

FIGURE 7 is an elevational view of the yoke and tongs in operativeposition supporting a piece of glass.

Referring now specifically to the drawings, in which like charactersrefer to like parts throughout, a track 10 is provided upon which acarriage 11 operates, the said carriagell comprising a "frame 12 withwheels 13, 13 mounted thereon, said wheels travelling upon flanges 14,14 on each side of the track 10. A bar, also called a rail, 15 isprovided of suitable length and size and may be flexibly secured tosimilar bars at each of its ends thereby producing a train of bars whichbars 15 are secured to the carriage 11 by any approved means, such aspins 15 The bars 15 have a plurality of yoke and tong assemblies movablymounted thereon which assemblies consist of a yoke 16 and tongs 17pivotally suspended therefrom, which said tongs grip and support a sheetof glass as will be more fully described hereinafter.

The track 10 is usually elliptical in form and extends through a heatingfurnace and also through the cooling or blowing apparatus usuallypositioned adjacent the discharge end of the furnace for temperingpurposes and extends out of and around the furnace and the blowingapparatus, so that the carriage 11 travels continuously on the track 10during the operation of the device with the pieces of glass beingmanually attached to the tong assemblies 17 before the glass enters thefurnace and detached therefrom by workmen at the discharge end of theblowing apparatus. The carriage 11 may be manually operated but isusually operated by cables with intermittent movement being providedwhereby the glass sheets are transported through the furnace and blowingapparatus in a step-by-step, timed operation. The glass is heated to adegree just below its softening point in the heating process before itenters the cooling apparatus and is retained in the cooling apparatus apre-determined time before being moved therefrom and detached from thetong assemblies. The heating operation is usually conducted in amulti-stage furnace while the cooling op eration is in a single stagewith the cooling operation corresponding to the length of time that thesheet of glass is retained in one stage of the heating furnace duringits travel therethrough.

The yoke and tong assemblies consist of a yoke 16 and tongs 17 hingedtogether and described in detail hereinafter. Each yoke .16 is normallyrectangular in shape and has leg portions 18 and 19 connected by a topportion 20 with a bolt 21 being provided which passes through the freeends of the leg portions 18 and 19' and has a sleeve bearing 22 mountedthereon, which sleeve 22 is approximately the same length as is thedistance between the legs 18 and 19 adjacent the top portion 20. Theyoke 16 is slightly longer than is the height of the bar 15 with thelegs 18 and 19 being spaced from the sides of the bar 15 with screws 23,23 being provided which extend through the legs 18 and 19 and providemeans whereby the sidewise swinging movement of the yoke 16 can belimited and controlled. The yoke 16 has a threaded member 24 mountedtherein with a lock nut 25 thereon by means of which the screw 24 can befirmly fixed in position, with the screw 24 having an extended roundedend portion 26 which normally is positioned into cup-shaped recesses 27,27 in the upper edge of the bar 15 so that a loose connection is formedfor the mounting of the yoke 16 on the bar 15 with movement thereonbeing limited by adjustment of the screws 23, 23 and the screw 24depending upon the conditions of use and the need of the particular kindof operation being conducted.

-A support member 28, for the tongs 17, is provided which has acylindrical bore therethrough into whichthe sleeve bearing 22 is fittedand which is slightly lesser in length than is the sleeve bearing 22, sothat freedom of movement of the member 28 is insured without bindingagainst the legs 18 and 19 of the yoke 16 at each of its ends. Spacedears 29 and 30 are integrally formed upon the support member 28 and havea pair of links 31 and 32 pivotally connected to the ears 29 and 30 atone of the ends by means of a bolt 33, which extends through both of theears 29 and 30 and is secured in place by a cotter pin 34*. The bolt 33preferably comprises a plurality of sections 33*, 34, 35, and 36 ofvarying diameters, the said sections of the bolt 33 decreasing indiameter from the head of the bolt towards the opposite end thereof withthe link 31 being mounted over the section 34 of the bolt 33 and thelink 32 being mounted over the section 35 of the bolt 33 throughopenings in each of the links 31 and 32 corresponding generally in sizeto the diameter of the sections 34 and 35, which because of the shoulderformed on each side of the sections 34 and 35 prevents the links 31 and32 from coming into close side surface contact with either the cars 29or 30 or with each other so that the possibility of the freezingtogether of these parts is prevented or minimized-to such a degree thatit is not apt to occur by the heat of the furnace. Spacers, such as 37,37, may be provided which maintain the distance which the links 31 and32 are spaced from each other and from the cars 29 and 30 and furtherprevent the possibility of the freezing together of the links at theirends because of the heat of the furnace and corrosion which is apt tooccur at this point. 7

The tongs 17, comprise a pair of legs 38 and 39 which are pivotallyconnected to the links 31 and 32 at their upper ends by means of rivets40, 40 which rivets have portions 41 and 42 of varying diameters, withthe'links 31 and 32 being mounted upon the portion of each rivet 40While the legs 38 and 39 of the tongs are mounted on the portion 42 ofeach of the rivets 40, 40 with a circumferential shoulder portion beingformed on each of the rivets 40, 40 which prevents the legs 38 and 39 ofthe tongs from moving away from a prescribed position on the rivets 40,40. If desired, spacers 43, 43 may be provided between the legs 37 and38 and the links 31 and 32.

The legs 38 and 39 cross each other and are secured together adjacenttheir lower ends by a rivet 44 which is similar to the rivets 40, 40 sothe connection of the legs is similar to that of the links 31 and 32with the legs 38 and '39 illustrated in FIG. 4 and FIG. 6 of thedrawings, and prevents freezing together of the legs at this point andpreserves ease of movement of the legs 38 and 39 about the rivet 44.

The lower portions 46 and 45 of the legs 38 and 39, respectively, areturned inward towards each other at least five degrees relative to thelongitudinal axis of the upper portions 38 and 39, and have screws 48and 49 mounted therein with reduced rounded inner ends 50 and 51 withflat surfaces at their extreme ends which engage the glass sheets, andlock nuts 52, 52 being mounted on the screws 48 and 49, respectively,whereby the screws may be locked in position in the end portions 46 and45 of the legs 38 and 39 and accurately spaced with respect to eachother to accurately grip the edge portion of a sheet of glass. Thespacing of the ends of the screws 48 and 49 is controlled by theoperator so as to conform to the varying thickness of the glass which isbeing processed.

A pin 53 is provided which is mounted in the end 45 of the leg 39 andengages the edge ofa piece of glass to form both a stop and a gauge forthe positioning of the ends 50 and 51 of the screws 48 and 49 along theedge of a piece of glass being processed so that the small indentationswhich may be produced by the ends 50 and 51 of the screws may be placedsufiiciently close to the edge of a piece of glass so that the pit marksof the screws 48 and 49 will be covered by the molding when theprocessed piece of glass is mounted in a television set, an oven door,or the like. The angularity of the portions 46 and 45 of the legs 38 and39 causes the screws 48 and 49 to engage the surface of the glass at aslightly upwardly angular position against the line of the downwardthrust of the piece of glass being supported so that even if a slightindentation is made in the glass due to its softened condition as itpasses through the furnace, the shallow pits formed in the glass by theends of the screws will be slightly deeper at the lower side than at theupper thereby increasing the holding power of the screws 48 and 49 andinsuring that the tongs grip the glass firmly enough to support it whileit is being processed in the heating furnace and particularly in thecooling apparatus where it may be subject to blasts of air.

The cars 29 and 30 are proportioned in length to the width of the links31 and 32 so that, when the links 31 and 32 are in a horizontal positionand in abutting engagemerit against the lower ends of the legs 18 and 19of the yoke, the tongs are in fully open position. Therefore, when thetongs are lifted by the operator gripping them at any point and given anupward push the tongs are opened to the limit of width at their lowerends which is always uniform and a maximum amount of spread is alwayssecured. If the links 31 and 32 could pass upward beyond a horizontalposition to an angular position, the legs 38 and 39 of the tongs wouldbe pulled inward and the spacing of the lower ends of the tongsdecreased. This spacing is exceedingly important in permitting theworkman in handling the glass to make almost a micrometric adjustment ofthe screws to allow a small amount of clearance for the easy and quickinsertion of a piece of glass, such as 54, in the tongs.

The spacing between the ends 50 and 51 of the screws 48 and 49 is alsoimportant because when the tongs are opened to their greatest spread anddownward stress imposed on the tongs, such as a piece of glass 54suspended therefrom, the pressure of the ends 50 and 51 on the screws 48and 49 is at its highest point because the position of the links 31 and32 at 180 produces the maximum leverage on the upper ends of the legs 38and 39 of the tongs. As the lower end of the tongs closes, the links 31and 32 pivot about the pin 33 as an axis and become angularly disposedto each other, thereby, reducing the leverage on the legs 38 and 39 andalso reducing the pressure of the screws 48 and 49 on the glass 54. Thepressure reduction is very slight within the range of 180 to 170position of the links 31 and 32, but as the angularity decreases below170 the force decreases very rapidly and if continued until the links 31and 32 were parallel to the legs 38 and 39, this pressure would beentirely lacking.

The adjustment of the screws 48 and 49 must be performed carefully sothat when the ends of the screws are in engagement with the glass 54,the angle of the links 31 and 32 may not be below 170 and the distancebetween the ends 51 and 52 of the screws may not be more than sufiicientto permit easy placement of the sheet of glass 54.

In operation the carriage 11 is moved to a position on the track 10 tothe entrance side of a heating furnace and the gripping screws 48 and 49are adiusted so that the ends of the screws are spaced a pre-determineddistance from each other depending upon the thickness of the piece ofglass to be treated. This distance is somewhat accurately chosen with asufficient clearance so that the edge of the untreated glass can easilypass between the ends of the screws when the tongs are open, and thereis not too much lost motion before the gripping screws come into engagedposition with the surface of the glass. The operator picks up a piece ofglass and by grasping any part of the tongs and pushing upward thereon,causes the tongs to open the maximum amount and the piece of glass isplaced in position in the tongs so that the edge thereof abuts againstthe stop 53. If two sets of tongs are needed the operation is proceededwith the opening of the next adjacent set of tongs and the glass placedtherein, the tongs released and the glass lowered slightly which causesthe tongs to close thereby gripping the surface of the glasssufiiciently so that the glass is suspended upon the tongs and then thecarriage is moved into the heating furnace and when the glass issufiiciently heated is passed on through to the cooling apparatus in theusual fashion, usually a. step by step operation.

In the normal loading and use of this device with the smaller pieces ofglass, the operation can easily, quickly and safely be handled by oneoperator because he can open the tongs with one hand and support theglass and insert it in the tongs with the other. The width of theopening of the tongs is uniform with each operation and is also positivein operation so that the pieces of glass are easily and quickly attachedto the tongs.

When the processing of the glass is completed and the carriage travelsout beyond the cooling apparatus to a reloading position the operator bymerely grasping the piece of glass, which normally has been cooledsufficiently so that the operator can handle the glass with gloves,simply lifts the piece of glass upward with one hand until the links ofthe tongs abut against the yokes which cause the opening of the tongs atthe lower ends thereby releasing the glass and it can be stacked orracked as may be desired. If large pieces of glass are treated and morethan one operator is required the steps described herein aresubstantially the same except that normally the operators will supportthe pieces of glass at each end, or one workman may support the glasswhile the other attaches the tongs to it. If the glass is suflicientlylarge and more than two sets of tongs are required, such tongs can beeasily applied to the bars in suflicient number to hold large pieces ofglass.

In adjusting the mechanism the screws 24 are turned down to engage inthe recesses 27 in the top of the bar with a slight amount of lostmotion, but not too much so that during the process of travel of theglass if the yokes are lifted slightly the ends 26 of the bolts 24 willnot be lifted clear of the recesses to permit canting of the yokes onthe bar 15. Also the screws 23, 23 in the legs 18 and 19 of the yoke areadjusted so that side movement of the yoke on the bar is limited, thisbeing important because when the glass is moved into the coolingapparatus and into the paths of coolin air being directed against it thesidewise movement of a sheet of glass may be suflicient to break theglass, particularly if there is considerable lost motion by the yoke 16and the bar 15 in a sidewise direction. \A fairly free movement in aplane parallel to the movement of the glass through the furnace andcooling apparatus is desirable without putting any particular strain onthe area of contact with the screws 48 and 49 with the glass.

It will therefore be understood that our invention provides a fairlyfree handling and operation means for pieces of glass and yet providesmeans whereby a firm grip is maintained along the marginal edge of theglass without the glass being cleaned or grease spots removed, and sidemovement of the sheets of glass is limited so that pieces of glass donot strike against the heating nozzles of the furnace or the air nozzlesin the cooling apparatus, which results in more satisfying operationsand a minimum of breakage of the glass as it is being processed.

While we have described more or less precisely the details ofconstruction, we do not wish to be understood as limiting ourselvesthereto, as we contemplate changes in form and the proportion of partsand the substitution of equivalents as circumstances may suggest orrender expedient Without departing from the spirit or scope of thisinvention.

What is claimed is:

1. Glass handling and transporting apparatus comprising in combination atrack, a carriage mounted thereon, a support bar mounted on the saidcarriage, yokes pivotally mounted on the said support bar, meansadjustably secured to each leg of said yokes whereby the movements ofsaid legs toward and away from said support bar is adjustablycontrolled, bolts connecting the leg portions of the yokes at their freeends, a bearing member on each of the said bolts, a tong supportingmember operatively mounted over said bearing member and of lesser lengththan the bearing member, and tongs secured to the support member.

2. Glass handling and transporting apparatus comprising in combination atrack, a carriage mounted thereon, a support bar mounted on the saidcarriage, yokes movably suspended on the said support bar, a .boltconnecting the leg portions of each of the yokes at their free ends, abearing member on each of the said bolts, a tong supporting member insaid bearing member of lesser length than the bearing member, the tongsupporting member having spaced ears thereon, a connecting memberextending through the said ears having a plurality of parts of varyingdiameters, and tongs mounted on the said connecting member on parts ofthe said connecting member of different diameters and spacer memberspositioned between the tong members whereby the tong members areretained in out of contact position with each other.

3. Glass handling and transporting apparatus comprising in combination atrack, a carriage mounted thereon, a support bar mounted on the saidcarriage, movable yokes suspended on the said support bar, boltsconnecting the leg portions of each yoke at their free ends, a bearingmember on each of the said bolts, a tong supporting member in saidbearing member of lesser length than the bearing member having spacedears thereon, a connecting member extending through the said ears,having a plurality of portions of varying diameters, tongs mounted onthe said connecting member and spacers fitted over the portions of theconnecting member having varying diameters and between portions of thetongs and the said ears.

4. Glass handling and transporting apparatus comprising in combination atrack, a carriage mounted thereon, a support bar mounted on the saidcarriage, yokes movably suspended on the said support bar, means in theside portions of the said yokes limiting the movement of the yokes onthe support bars in a sidewise direction, bolts connecting the legportions of the yokes at their free ends, a hearing member on each ofthe said bolts, 21 tong supporting member in said bearing member oflesser length than the bearing member, and tongs secured to the saidsupport member.

5. Glass handling and transporting apparatus comprising in combination atrack, a carriage mounted thereon, a support bar mounted on the saidcarriage, yokes movably suspended on the said support bar, bolts in theleg portions of the yokes whereby the side movement of the yokes on thesupport bars is limited, bolts connecting the leg portions of the yokesat their free ends, a bearing member on each of the said bolts, a tongsupporting member in said bearing member of lesser length than thebearing member, and tongs secured to the said support member.

6. Glass handling and transporting apparatus comp-rising in combinationa track, movable carriages mounted on the said track, a rail suspendedfrom each of the said carriages, a plurality of yokes mounted on thesaid rail, loosely mounted tong suspension members on the said yokes,sets of tongs mounted on the said suspension members, each set of tongscomprising a pair of connecting links pivotally connected to thesuspension member on its respective yoke at one of their ends, a pair ofleg members pivoted together adjacent their lower ends and pivotallyconnected at their upper ends to the said links with the lower ends ofeach or" the said legs extending inwardly toward each other at an angleof at least five degrees to the longitudinal axis of the said legs andgripping screws mounted in the lower ends of the said legs.

7. Glass handling and transporting apparatus comprising in combination atrack, movable carriages mounted on the said track, a rail suspendedfrom each of the said carriages, a plurality of yokes mounted on thesaid rail, loosely mounted tong suspension members on the said yokes,sets of tongs mounted on the said suspension members, each set of tongscomprising a pair of connecting links pivotally connected to thesuspension member on its respective yoke at one of their ends, a pair ofleg member pivoted together adjacent their lower ends and pivot allyconnected at their upper ends to the said links with the lower ends ofeach of the said legs extending inwardly toward each other at an angleof at least five degrees to the longitudinal axis of the said legs andgripping screws mounted in the lower ends of the said legs, the saidlinks abutting against the ends of the said yokes at the maximum pointof the open position of the said tongs.

8. Glass handling and transporting apparatus comprising in combination atrack, movable carriages mounted on the said track, a rail suspendedfrom each of the said carriages, a plurality of yokes mounted on thesaid rail, loosely mounted tong suspension members on each of the saidyokes, sets of tongs mounted on said suspension members, each set oftongs comprising a pair of connecting links pivotally connected to thesuspension member on its respective yoke at one of their ends, a pair ofleg members pivoted together adjacent their lower ends and pivotallyconnected at their upper ends to the ends of the said links with thelower ends of each of the said legs extending inwardly toward each otherat an angle of at least five degrees to the longitudinal axis of thesaid legs and gripping screws mounted in the lower end of the said legs,the pivotal connection of the links and the tongs being of varyingdiameters and spacer means positioned between the link members andbetween the tong members whereby the tongs and links are held in out ofengaged position with each other.

9. Glass handling and transporting apparatus comprising in combination atrack, movable carriages mounted on the said track, a rail suspendedfrom each of the said carriages, a plurality of yokes mounted on thesaid rail, loosely mounted tong suspension members on the said yokes,sets of tongs mounted on the said suspension members, each set of tongscomprising a pair of connecting links pivotally connected to thesuspension member on its respective yoke at one of their ends, a pair ofleg members pivoted together adjacent their lower ends and pivotallyconnected at their upper ends to the ends of the said links with thelower ends of each of the said legs extending inwardly toward each otherat an angle of at least five degrees to the longitudinal axis of thesaid legs, a stop in one of said legs spaced from the gripping screw inthe lower end of the said leg.

10. Glass handling and transporting apparatus comprising in combinationa track, movable carriages mounted on the said track, a rail Suspendedfrom each of the said carriages, a plurality of yokes mounted on thesaid rail, loosely mounted tong suspension members on the said yokes,sets of tongs mounted on the said suspension members, each set of tongscomprising a pair of connecting links pivotally connected to asuspension member on its respective yoke at one of their ends, a pair ofleg members pivoted together adjacent their lower ends and pivotallyconnected at their upper ends to the ends of the said links with thelower ends of the said legs extending inwardly toward each other at anangle of at least five degree to the longitudinal axis of the said legs,a pin positioned in one of said legs adjacent the lower end thereof andextending towards the other leg and spaced from. the gripping screw inthe said leg.

11. A glass handling and transporting apparatus comprising incombination a track, a plurality of carriage members mounted formovement along said track, a plurality of support bars each of which ismounted to at least two of said carriage members, at least two yokemembers pivotally mounted on each support bar, means adjustably securedto each leg of each of said yokes whereby the movements of said legstoward and away from said support bar is adjustably controlled, a boltconnecting the leg portions of each yoke at its free end, a bearingmemher on each of said bolts, a tong supporting member operativelymounted over said bearing member and of lesser length than the bearingmember and tongs secured to the support member.

References Cited in the file of this patent UNITED STATES PATENTS UNITEDSTATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N00 3 OlO, 753November 28 1961 George A. Russ et a1,,

It is hereby certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent should read ascorrected below.

In the grant, lines 3 and l3 and in the heading to the printedspecification, lines 5 and 6 name of assignee, for "The AmericanSecurity Company-" each oceurrencm read The American Securit CompanySigned and sealed this 17th day of April 1962.,

. (SEAL) Attest:

ESTON s. JOHNSON DAVID L. LADD Attesting Officer 7 Commissioner ofPatents

